Method and device for determining rsrp in nr v2x

ABSTRACT

A method for performing wireless communication by a first device and a device for supporting same are provided. The method may include receiving a plurality of reference signals from a second device through a physical sidelink control channel (PSCCH) or a physical sidelink shared channel (PSSCH), herein, the plurality of reference signals are transmitted through a plurality of antenna ports, determining a reference signal received power (RSRP) value using the plurality of reference signals based on indexes for the plurality of antenna ports, and transmitting the RSRP value to the second device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.17/518,271, filed on Nov. 3, 2021, which is a continuation pursuant to35 U.S.C. §119(e) of International Application PCT/KR2020/005916, withan international filing date of May 4, 2020, which claims the benefit ofU.S. Provisional Patent Application No. 62/843,355, filed on May 3,2019, and U.S. Provisional Patent Application No. 62/843,353, filed onMay 3, 2019, the contents of which are hereby incorporated by referenceherein in their entirety.

BACKGROUND OF THE DISCLOSURE Field of the disclosure

This disclosure relates to a wireless communication system.

Related Art

Sidelink (SL) communication is a communication scheme in which a directlink is established between User Equipments (UEs) and the UEs exchangevoice and data directly with each other without intervention of anevolved Node B (eNB). SL communication is under consideration as asolution to the overhead of an eNB caused by rapidly increasing datatraffic.

Vehicle-to-everything (V2X) refers to a communication technology throughwhich a vehicle exchanges information with another vehicle, apedestrian, an object having an infrastructure (or infra) establishedtherein, and so on. The V2X may be divided into 4 types, such asvehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I),vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2Xcommunication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require largercommunication capacities, the need for mobile broadband communicationthat is more enhanced than the existing Radio Access Technology (RAT) isrising. Accordingly, discussions are made on services and user equipment(UE) that are sensitive to reliability and latency. And, a nextgeneration radio access technology that is based on the enhanced mobilebroadband communication, massive Machine Type Communication (MTC),Ultra-Reliable and Low Latency Communication (URLLC), and so on, may bereferred to as a new radio access technology (RAT) or new radio (NR).Herein, the NR may also support vehicle-to-everything (V2X)communication.

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR. Theembodiment of FIG. 1 may be combined with various embodiments of thepresent disclosure.

Regarding V2X communication, a scheme of providing a safety service,based on a V2X message such as Basic Safety Message (BSM), CooperativeAwareness Message (CAM), and Decentralized Environmental NotificationMessage (DENM) is focused in the discussion on the RAT used before theNR. The V2X message may include position information, dynamicinformation, attribute information, or the like. For example, a UE maytransmit a periodic message type CAM and/or an event triggered messagetype DENM to another UE.

For example, the CAM may include dynamic state information of thevehicle such as direction and speed, static data of the vehicle such asa size, and basic vehicle information such as an exterior illuminationstate, route details, or the like. For example, the UE may broadcast theCAM, and latency of the CAM may be less than 100 ms. For example, the UEmay generate the DENM and transmit it to another UE in an unexpectedsituation such as a vehicle breakdown, accident, or the like. Forexample, all vehicles within a transmission range of the UE may receivethe CAM and/or the DENM. In this case, the DENM may have a higherpriority than the CAM.

Thereafter, regarding V2X communication, various V2X scenarios areproposed in NR. For example, the various V2X scenarios may includevehicle platooning, advanced driving, extended sensors, remote driving,or the like.

For example, based on the vehicle platooning, vehicles may move togetherby dynamically forming a group. For example, in order to perform platoonoperations based on the vehicle platooning, the vehicles belonging tothe group may receive periodic data from a leading vehicle. For example,the vehicles belonging to the group may decrease or increase an intervalbetween the vehicles by using the periodic data.

For example, based on the advanced driving, the vehicle may besemi-automated or fully automated. For example, each vehicle may adjusttrajectories or maneuvers, based on data obtained from a local sensor ofa proximity vehicle and/or a proximity logical entity. In addition, forexample, each vehicle may share driving intention with proximityvehicles.

For example, based on the extended sensors, raw data, processed data, orlive video data obtained through the local sensors may be exchangedbetween a vehicle, a logical entity, a UE of pedestrians, and/or a V2Xapplication server. Therefore, for example, the vehicle may recognize amore improved environment than an environment in which a self-sensor isused for detection.

For example, based on the remote driving, for a person who cannot driveor a remote vehicle in a dangerous environment, a remote driver or a V2Xapplication may operate or control the remote vehicle. For example, if aroute is predictable such as public transportation, cloud computingbased driving may be used for the operation or control of the remotevehicle. In addition, for example, an access for a cloud-based back-endservice platform may be considered for the remote driving.

Meanwhile, a scheme of specifying service requirements for various V2Xscenarios such as vehicle platooning, advanced driving, extendedsensors, remote driving, or the like is discussed in NR-based V2Xcommunication.

SUMMARY OF THE DISCLOSURE Technical Objects

Meanwhile, in wireless communication system, a UE may perform referencesignal received power (RSRP) measurement by using reference signalstransmitted through a plurality of antenna ports. For example, the UEmay perform RSRP measurement using reference signals transmitted througha plurality of antenna ports on a pre-defined channel. For example, RSRPmeasurement may include L1 RSRP measurement. For example, when measuringRSRP for demodulation reference signal (DM-RS) on a physical sidelinkcontrol channel(PSCCH)/physical sidelink shared channel(PSSCH) duringthe sensing operation of the UE, the UE may perform RSRP measurementusing reference signals transmitted through a plurality of antennaports. For example, for estimating the sidelink pathloss of thetransmitting UE, when the receiving UE measures/reports RSRP for asidelink channel state information (CSI)-RS or a DM-RS on a PSCCH/PSSCH,the receiving UE may perform RSRP measurement by using RSs transmittedthrough a plurality of antenna ports. A method for efficientlysupporting RSRP measurement using reference signals transmitted througha plurality of antenna ports may be required. Technical Solutions

In an embodiment, there is provided a method of performing wirelesscommunication by a first device. The method may include receiving aplurality of reference signals from a second device through a physicalsidelink control channel (PSCCH) or a physical sidelink shared channel(PSSCH), herein, the plurality of reference signals are transmittedthrough a plurality of antenna ports, determining a reference signalreceived power (RSRP) value using the plurality of reference signalsbased on indexes for the plurality of antenna ports, and transmittingthe RSRP value to the second device.

Effects of the disclosure

A UE may effectively perform sidelink communication.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR.

FIG. 2 shows a structure of an NR system, in accordance with anembodiment of the present disclosure.

FIG. 3 shows a functional division between an NG-RAN and a SGC, inaccordance with an embodiment of the present disclosure.

FIGS. 4A-4B show a radio protocol architecture, in accordance with anembodiment of the present disclosure.

FIG. 5 shows a structure of an NR system, in accordance with anembodiment of the present disclosure.

FIG. 6 shows a structure of a slot of an NR frame, in accordance with anembodiment of the present disclosure.

FIG. 7 shows an example of a BWP, in accordance with an embodiment ofthe present disclosure.

FIGS. 8A-8B show a radio protocol architecture for a SL communication,in accordance with an embodiment of the present disclosure.

FIG. 9 shows a UE performing V2X or SL communication, in accordance withan embodiment of the present disclosure.

FIGS. 10A-10B show a procedure of performing V2X or SL communication bya UE based on a transmission mode, in accordance with an embodiment ofthe present disclosure.

FIGS. 11A-11C show three cast types, in accordance with an embodiment ofthe present disclosure.

FIG. 12 shows multiplexing cases of a PSCCH and a PSSCH related with thePSCCH, in accordance with an embodiment of the present disclosure.

FIG. 13 shows a procedure for a UE to determine RSRP based on an indexof an antenna port, in accordance with an embodiment of the presentdisclosure.

FIG. 14 shows a procedure for a UE to determine RSRP based oninformation related to FDM in accordance with an embodiment of thepresent disclosure.

FIG. 15 shows a procedure for compensating for a first offset value anda second offset value to a RSRP value measured by a UE in accordancewith an embodiment of the present disclosure.

FIG. 16 shows a procedure for a UE to perform a plurality of TB-relatedtransmissions in accordance with an embodiment of the presentdisclosure.

FIG. 17 shows a method for a first device to determine RSRP based onindexes for a plurality of antenna ports in accordance with anembodiment of the present disclosure.

FIG. 18 shows a method for a second device to receive the RSRP valuefrom a first device in accordance with an embodiment of the presentdisclosure.

FIG. 19 shows a communication system 1, in accordance with an embodimentof the present disclosure.

FIG. 20 shows wireless devices, in accordance with an embodiment of thepresent disclosure.

FIG. 21 shows a signal process circuit for a transmission signal, inaccordance with an embodiment of the present disclosure.

FIG. 22 shows a wireless device, in accordance with an embodiment of thepresent disclosure.

FIG. 23 shows a hand-held device, in accordance with an embodiment ofthe present disclosure.

FIG. 24 shows a car or an autonomous vehicle, in accordance with anembodiment of the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the present specification, “A or B” may mean “only A”, “only B” or“both A and B.” In other words, in the present specification, “A or B”may be interpreted as “A and/or B”. For example, in the presentspecification, “A, B, or C” may mean “only A”, “only B”, “only C”, or“any combination of A, B, C”.

A slash (/) or comma used in the present specification may mean“and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B”may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C”may mean “A, B, or C”.

In the present specification, “at least one of A and B” may mean “onlyA”, “only B”, or “both A and B”. In addition, in the presentspecification, the expression “at least one of A or B” or “at least oneof A and/or B” may be interpreted as “at least one of A and B”.

In addition, in the present specification, “at least one of A, B, and C”may mean “only A”, “only B”, “only C”, or “any combination of A, B, andC”. In addition, “at least one of A, B, or C” or “at least one of A, B,and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present specification may mean“for example”. Specifically, when indicated as “control information(PDCCH)”, it may mean that “PDCCH” is proposed as an example of the“control information”. In other words, the “control information” of thepresent specification is not limited to “PDCCH”, and “PDDCH” may beproposed as an example of the “control information”. In addition, whenindicated as “control information (i.e., PDCCH)”, it may also mean that“PDCCH” is proposed as an example of the “control information”.

A technical feature described individually in one figure in the presentspecification may be individually implemented, or may be simultaneouslyimplemented.

The technology described below may be used in various wirelesscommunication systems such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and so on. TheCDMA may be implemented with a radio technology, such as universalterrestrial radio access (UTRA) or CDMA-2000. The TDMA may beimplemented with a radio technology, such as global system for mobilecommunications (GSM)/general packet ratio service (GPRS)/enhanced datarate for GSM evolution (EDGE). The OFDMA may be implemented with a radiotechnology, such as institute of electrical and electronics engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA(E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16eand provides backward compatibility with a system based on the IEEE802.16e. The UTRA is part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTEuses the OFDMA in a downlink and uses the SC-FDMA in an uplink.LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a newClean-slate type mobile communication system having the characteristicsof high performance, low latency, high availability, and so on. 5G NRmay use resources of all spectrum available for usage including lowfrequency bands of less than 1 GHz, middle frequency bands ranging from1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more,and so on.

For clarity in the description, the following description will mostlyfocus on LTE-A or 5G NR. However, technical features according to anembodiment of the present disclosure will not be limited only to this.

FIG. 2 shows a structure of an NR system, in accordance with anembodiment of the present disclosure. The embodiment of FIG. 2 may becombined with various embodiments of the present disclosure.

Referring to FIG. 2 , a next generation-radio access network (NG-RAN)may include a BS 20 providing a UE 10 with a user plane and controlplane protocol termination. For example, the BS 20 may include a nextgeneration-Node B (gNB) and/or an evolved-NodeB (eNB). For example, theUE 10 may be fixed or mobile and may be referred to as other terms, suchas a mobile station (MS), a user terminal (UT), a subscriber station(SS), a mobile terminal (MT), wireless device, and so on. For example,the BS may be referred to as a fixed station which communicates with theUE 10 and may be referred to as other terms, such as a base transceiversystem (BTS), an access point (AP), and so on.

The embodiment of FIG. 2 exemplifies a case where only the gNB isincluded. The BSs 20 may be connected to one another via Xn interface.The BS 20 may be connected to one another via 5th generation (5G) corenetwork (5GC) and NG interface. More specifically, the BSs 20 may beconnected to an access and mobility management function (AMF) 30 viaNG-C interface, and may be connected to a user plane function (UPF) 30via NG-U interface.

FIG. 3 shows a functional division between an NG-RAN and a 5GC, inaccordance with an embodiment of the present disclosure.

Referring to FIG. 3 , the gNB may provide functions, such as Inter CellRadio Resource Management (RRM), Radio Bearer (RB) control, ConnectionMobility Control, Radio Admission Control, Measurement Configuration &Provision, Dynamic Resource Allocation, and so on. An AMF may providefunctions, such as Non Access Stratum (NAS) security, idle statemobility processing, and so on. A UPF may provide functions, such asMobility Anchoring, Protocol Data Unit (PDU) processing, and so on. ASession Management Function (SMF) may provide functions, such as userequipment (UE) Internet Protocol (IP) address allocation, PDU sessioncontrol, and so on.

Layers of a radio interface protocol between the UE and the network canbe classified into a first layer (L1), a second layer (L2), and a thirdlayer (L3) based on the lower three layers of the open systeminterconnection (OSI) model that is well-known in the communicationsystem. Among them, a physical (PHY) layer belonging to the first layerprovides an information transfer service by using a physical channel,and a radio resource control (RRC) layer belonging to the third layerserves to control a radio resource between the UE and the network. Forthis, the RRC layer exchanges an RRC message between the UE and the BS.

FIGS. 4A-4B show a radio protocol architecture, in accordance with anembodiment of the present disclosure. The embodiment of FIGS. 4A-4B maybe combined with various embodiments of the present disclosure.Specifically, FIG. 4A shows a radio protocol architecture for a userplane, and FIG. 4B shows a radio protocol architecture for a controlplane. The user plane corresponds to a protocol stack for user datatransmission, and the control plane corresponds to a protocol stack forcontrol signal transmission.

Referring to FIGS. 4A-4B, a physical layer provides an upper layer withan information transfer service through a physical channel. The physicallayer is connected to a medium access control (MAC) layer which is anupper layer of the physical layer through a transport channel. Data istransferred between the MAC layer and the physical layer through thetransport channel. The transport channel is classified according to howand with what characteristics data is transmitted through a radiointerface.

Between different physical layers, i.e., a physical layer of atransmitter and a physical layer of a receiver, data are transferredthrough the physical channel. The physical channel is modulated using anorthogonal frequency division multiplexing (OFDM) scheme, and utilizestime and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer,which is a higher layer of the MAC layer, via a logical channel. The MAClayer provides a function of mapping multiple logical channels tomultiple transport channels. The MAC layer also provides a function oflogical channel multiplexing by mapping multiple logical channels to asingle transport channel. The MAC layer provides data transfer servicesover logical channels.

The RLC layer performs concatenation, segmentation, and reassembly ofRadio Link Control Service Data Unit (RLC SDU). In order to ensurediverse quality of service (QoS) required by a radio bearer (RB), theRLC layer provides three types of operation modes, i.e., a transparentmode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM).An AM RLC provides error correction through an automatic repeat request(ARQ).

A radio resource control (RRC) layer is defined only in the controlplane. The RRC layer serves to control the logical channel, thetransport channel, and the physical channel in association withconfiguration, reconfiguration and release of RBs. The RB is a logicalpath provided by the first layer (i.e., the physical layer or the PHYlayer) and the second layer (i.e., the MAC layer, the RLC layer, and thepacket data convergence protocol (PDCP) layer) for data delivery betweenthe UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the userplane include user data delivery, header compression, and ciphering.Functions of a PDCP layer in the control plane include control-planedata delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in auser plane. The SDAP layer performs mapping between a Quality of Service(QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) markingin both DL and UL packets.

The configuration of the RB implies a process for specifying a radioprotocol layer and channel properties to provide a particular serviceand for determining respective detailed parameters and operations. TheRB can be classified into two types, i.e., a signaling RB (SRB) and adata RB (DRB). The SRB is used as a path for transmitting an RRC messagein the control plane. The DRB is used as a path for transmitting userdata in the user plane.

When an RRC connection is established between an RRC layer of the UE andan RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and,otherwise, the UE may be in an RRC_IDLE state. In case of the NR, anRRC_INACTIVE state is additionally defined, and a UE being in theRRC_INACTIVE state may maintain its connection with a core networkwhereas its connection with the BS is released.

Data is transmitted from the network to the UE through a downlinktransport channel. Examples of the downlink transport channel include abroadcast channel (BCH) for transmitting system information and adownlink-shared channel (SCH) for transmitting user traffic or controlmessages. Traffic of downlink multicast or broadcast services or thecontrol messages can be transmitted on the downlink-SCH or an additionaldownlink multicast channel (MCH). Data is transmitted from the UE to thenetwork through an uplink transport channel. Examples of the uplinktransport channel include a random access channel (RACH) fortransmitting an initial control message and an uplink SCH fortransmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of thetransport channel and mapped onto the transport channels include abroadcast channel (BCCH), a paging control channel (PCCH), a commoncontrol channel (CCCH), a multicast control channel (MCCH), a multicasttraffic channel (MTCH), etc.

The physical channel includes several OFDM symbols in a time domain andseveral sub-carriers in a frequency domain. One sub-frame includes aplurality of OFDM symbols in the time domain. A resource block is a unitof resource allocation, and consists of a plurality of OFDM symbols anda plurality of sub-carriers. Further, each subframe may use specificsub-carriers of specific OFDM symbols (e.g., a first OFDM symbol) of acorresponding subframe for a physical downlink control channel (PDCCH),i.e., an L1/L2 control channel. A transmission time interval (TTI) is aunit time of subframe transmission.

FIG. 5 shows a structure of an NR system, in accordance with anembodiment of the present disclosure. The embodiment of FIG. 5 may becombined with various embodiments of the present disclosure.

Referring to FIG. 5 , in the NR, a radio frame may be used forperforming uplink and downlink transmission. A radio frame has a lengthof 10 ms and may be defined to be configured of two half-frames (HFs). Ahalf-frame may include five 1 ms subframes (SFs). A subframe (SF) may bedivided into one or more slots, and the number of slots within asubframe may be determined in accordance with subcarrier spacing (SCS).Each slot may include 12 or 14 OFDM(A) symbols according to a cyclicprefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In caseof using an extended CP, each slot may include 12 symbols. Herein, asymbol may include an OFDM symbol (or CP-OFDM symbol) and a SingleCarrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM(DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols perslot (N^(slot) _(symb)), a number slots per frame (N^(frame,u) _(slot)),and a number of slots per subframe (N^(subframe,u) _(slot)) based on anSCS configuration (u), in a case where a normal CP is used.

TABLE 1 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot)N^(subframe, u) _(slot) 15 KHz (u = 0) 14 10 1 30 KHz (u = 1) 14 20 2 60KHz (u = 2) 14 40 4 120 KHz (u = 3)  14 80 8 240 KHz (u = 4)  14 160 16

Table 2 shows an example of a number of symbols per slot, a number ofslots per frame, and a number of slots per subframe in accordance withthe SCS, in a case where an extended CP is used.

TABLE 2 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot)N^(subframe, u) _(slot) 60 KHz (u = 2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SUS, UP length, and so on)between multiple cells being integrate to one UE may be differentlyconfigured. Accordingly, a (absolute time) duration (or section) of atime resource (e.g., subframe, slot or TTI) (collectively referred to asa time unit (TU) for simplicity) being configured of the same number ofsymbols may be differently configured in the integrated cells.

In the NR, multiple numerologies or SCSs for supporting diverse 5Gservices may be supported. For example, in case an SCS is 15 kHz, a widearea of the conventional cellular bands may be supported, and, in casean SCS is 30 kHz/60 kHz a dense-urban, lower latency, wider carrierbandwidth may be supported. In case the SCS is 60 kHz or higher, abandwidth that is greater than 24.25 GHz may be used in order toovercome phase noise. [79] An NR frequency band may be defined as twodifferent types of frequency ranges. The two different types offrequency ranges may be FR1 and FR2. The values of the frequency rangesmay be changed (or varied), and, for example, the two different types offrequency ranges may be as shown below in Table 3. Among the frequencyranges that are used in an NR system, FR1 may mean a “sub 6 GHz range”,and FR2 may mean an “above 6 GHz range” and may also be referred to as amillimeter wave (mmW).

TABLE 3 Frequency Range Corresponding Subcarrier Spacing designationfrequency range (SCS) FR1  450 MHz-6000 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

As described above, the values of the frequency ranges in the NR systemmay be changed (or varied). For example, as shown below in Table 4, FR1may include a band within a range of 410 MHz to 7125 MHz. Morespecifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900,5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz(or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1mat include an unlicensed band. The unlicensed band may be used fordiverse purposes, e.g., the unlicensed band for vehicle-specificcommunication (e.g., automated driving).

TABLE 4 Frequency Range Corresponding Subcarrier Spacing designationfrequency range (SCS) FR1  410 MHz-7125 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

FIG. 6 shows a structure of a slot of an NR frame, in accordance with anembodiment of the present disclosure.

Referring to FIG. 6 , a slot includes a plurality of symbols in a timedomain. For example, in case of a normal CP, one slot may include 14symbols. However, in case of an extended CP, one slot may include 12symbols. Alternatively, in case of a normal CP, one slot may include 7symbols. However, in case of an extended CP, one slot may include 6symbols.

A carrier includes a plurality of subcarriers in a frequency domain. AResource Block (RB) may be defined as a plurality of consecutivesubcarriers (e.g., 12 subcarriers) in the frequency domain. A BandwidthPart (BWP) may be defined as a plurality of consecutive (Physical)Resource Blocks ((P)RBs) in the frequency domain, and the BWP maycorrespond to one numerology (e.g., SCS, CP length, and so on). Acarrier may include a maximum of N number BWPs (e.g., 5 BWPs). Datacommunication may be performed via an activated BWP. Each element may bereferred to as a Resource Element (RE) within a resource grid and onecomplex symbol may be mapped to each element.

Meanwhile, a radio interface between a UE and another UE or a radiointerface between the UE and a network may consist of an L1 layer, an L2layer, and an L3 layer. In various embodiments of the presentdisclosure, the L1 layer may imply a physical layer. In addition, forexample, the L2 layer may imply at least one of a MAC layer, an RLClayer, a PDCP layer, and an SDAP layer. In addition, for example, the L3layer may imply an RRC layer.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in agiven numerology. The PRB may be selected from consecutive sub-sets ofcommon resource blocks (CRBs) for the given numerology on a givencarrier.

When using bandwidth adaptation (BA), a reception bandwidth andtransmission bandwidth of a UE are not necessarily as large as abandwidth of a cell, and the reception bandwidth and transmissionbandwidth of the BS may be adjusted. For example, a network/BS mayinform the UE of bandwidth adjustment. For example, the UE receiveinformation/configuration for bandwidth adjustment from the network/BS.In this case, the UE may perform bandwidth adjustment based on thereceived information/configuration. For example, the bandwidthadjustment may include an increase/decrease of the bandwidth, a positionchange of the bandwidth, or a change in subcarrier spacing of thebandwidth.

For example, the bandwidth may be decreased during a period in whichactivity is low to save power. For example, the position of thebandwidth may move in a frequency domain. For example, the position ofthe bandwidth may move in the frequency domain to increase schedulingflexibility. For example, the subcarrier spacing of the bandwidth may bechanged. For example, the subcarrier spacing of the bandwidth may bechanged to allow a different service. A subset of a total cell bandwidthof a cell may be called a bandwidth part (BWP). The BA may be performedwhen the BS/network configures the BWP to the UE and the BS/networkinforms the UE of the BWP currently in an active state among theconfigured BWPs.

For example, the BWP may be at least any one of an active BWP, aninitial BWP, and/or a default BWP. For example, the UE may not monitordownlink radio link quality in a DL BWP other than an active DL BWP on aprimary cell (PCell). For example, the UE may not receive PDCCH, PDSCH,or CSI-RS (excluding RRM) outside the active DL BWP. For example, the UEmay not trigger a channel state information (CSI) report for theinactive DL BWP. For example, the UE may not transmit PUCCH or PUSCHoutside an active UL BWP. For example, in a downlink case, the initialBWP may be given as a consecutive RB set for an RMSI CORESET (configuredby PBCH). For example, in an uplink case, the initial BWP may be givenby SIB for a random access procedure. For example, the default BWP maybe configured by a higher layer. For example, an initial value of thedefault BWP may be an initial DL BWP. For energy saving, if the UE failsto detect DCI during a specific period, the UE may switch the active BWPof the UE to the default BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used intransmission and reception. For example, a transmitting UE may transmitan SL channel or an SL signal on a specific BWP, and a receiving UE mayreceive the SL channel or the SL signal on the specific BWP. In alicensed carrier, the SL BWP may be defined separately from a Uu BWP,and the SL BWP may have configuration signaling separate from the UuBWP. For example, the UE may receive a configuration for the SL BWP fromthe BS/network. The SL BWP may be (pre-)configured in a carrier withrespect to an out-of-coverage NR V2X UE and an RRC_IDLE UE. For the UEin the RRC_CONNECTED mode, at least one SL BWP may be activated in thecarrier.

FIG. 7 shows an example of a BWP, in accordance with an embodiment ofthe present disclosure. The embodiment of FIG. 7 may be combined withvarious embodiments of the present disclosure. It is assumed in theembodiment of FIG. 7 that the number of BWPs is 3.

Referring to FIG. 7 , a common resource block (CRB) may be a carrierresource block numbered from one end of a carrier band to the other endthereof. In addition, the PRB may be a resource block numbered withineach BWP. A point A may indicate a common reference point for a resourceblock grid.

The BWP may be configured by a point A, an offset N^(start) _(BWP) fromthe point A, and a bandwidth N^(size) _(BWP). For example, the point Amay be an external reference point of a PRB of a carrier in which asubcarrier 0 of all numerologies (e.g., all numerologies supported by anetwork on that carrier) is aligned. For example, the offset may be aPRB interval between a lowest subcarrier and the point A in a givennumerology. For example, the bandwidth may be the number of PRBs in thegiven numerology.

Hereinafter, V2X or SL communication will be described.

FIGS. 8A-8B show a radio protocol architecture for a SL communication,in accordance with an embodiment of the present disclosure. Theembodiment of FIGS. 8A-8B may be combined with various embodiments ofthe present disclosure. More specifically, FIG. 8A shows a user planeprotocol stack, and FIG. 8B shows a control plane protocol stack.

Hereinafter, a sidelink synchronization signal (SLSS) andsynchronization information will be described.

The SLSS may include a primary sidelink synchronization signal (PSSS)and a secondary sidelink synchronization signal (SSSS), as anSL-specific sequence. The PSSS may be referred to as a sidelink primarysynchronization signal (S-PSS), and the SSSS may be referred to as asidelink secondary synchronization signal (S-SSS). For example,length-127 M-sequences may be used for the S-PSS, and length-127 goldsequences may be used for the S-SSS. For example, a UE may use the S-PSSfor initial signal detection and for synchronization acquisition. Forexample, the UE may use the S-PSS and the S-SSS for acquisition ofdetailed synchronization and for detection of a synchronization signalID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast)channel for transmitting default (system) information which must befirst known by the UE before SL signal transmission/reception. Forexample, the default information may be information related to SLSS, aduplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL)configuration, information related to a resource pool, a type of anapplication related to the SLSS, a subframe offset, broadcastinformation, or the like. For example, for evaluation of PSBCHperformance, in NR V2X, a payload size of the PSBCH may be 56 bitsincluding 24-bit CRC.

The S-PSS, the S-SSS, and the PSBCH may be included in a block format(e.g., SL synchronization signal (SS)/PSBCH block, hereinafter,sidelink-synchronization signal block (S-SSB)) supporting periodicaltransmission. The S-SSB may have the same numerology (i.e., SCS and CPlength) as a physical sidelink control channel (PSCCH)/physical sidelinkshared channel (PSSCH) in a carrier, and a transmission bandwidth mayexist within a (pre-) configured sidelink (SL) BWP. For example, theS-SSB may have a bandwidth of 11 resource blocks (RBs). For example, thePSBCH may exist across 11 RBs. In addition, a frequency position of theS-SSB may be (pre-)configured. Accordingly, the UE does not have toperform hypothesis detection at frequency to discover the S-SSB in thecarrier.

FIG. 9 shows a UE performing V2X or SL communication, in accordance withan embodiment of the present disclosure. The embodiment of FIG. 9 may becombined with various embodiments of the present disclosure.

Referring to FIG. 9 , in V2X or SL communication, the term ‘UE’ maygenerally imply a UE of a user. However, if a network equipment such asa BS transmits/receives a signal according to a communication schemebetween UEs, the BS may also be regarded as a sort of the UE. Forexample, a UE 1 may be a first apparatus 100, and a UE 2 may be a secondapparatus 200.

For example, the UE 1 may select a resource unit corresponding to aspecific resource in a resource pool which implies a set of series ofresources. In addition, the UE 1 may transmit an SL signal by using theresource unit. For example, a resource pool in which the UE 1 is capableof transmitting a signal may be configured to the UE 2 which is areceiving UE, and the signal of the UE 1 may be detected in the resourcepool.

Herein, if the UE 1 is within a connectivity range of the BS, the BS mayinform the UE 1 of the resource pool. Otherwise, if the UE 1 is out ofthe connectivity range of the BS, another UE may inform the UE 1 of theresource pool, or the UE 1 may use a pre-configured resource pool.

In general, the resource pool may be configured in unit of a pluralityof resources, and each UE may select a unit of one or a plurality ofresources to use it in SL signal transmission thereof.

Hereinafter, resource allocation in SL will be described.

FIGS. 10A-10B show a procedure of performing V2X or SL communication bya UE based on a transmission mode, in accordance with an embodiment ofthe present disclosure. The embodiment of FIGS. 10A-10B may be combinedwith various embodiments of the present disclosure. In variousembodiments of the present disclosure, the transmission mode may becalled a mode or a resource allocation mode. Hereinafter, forconvenience of explanation, in LTE, the transmission mode may be calledan LTE transmission mode. In NR, the transmission mode may be called anNR resource allocation mode.

For example, FIG. 10A shows a UE operation related to an LTEtransmission mode 1 or an LTE transmission mode 3. Alternatively, forexample, FIG. 10A shows a UE operation related to an NR resourceallocation mode 1. For example, the LTE transmission mode 1 may beapplied to general SL communication, and the LTE transmission mode 3 maybe applied to V2X communication.

For example, FIG. 10B shows a UE operation related to an LTEtransmission mode 2 or an LTE transmission mode 4. Alternatively, forexample, FIG. 10B shows a UE operation related to an NR resourceallocation mode 2.

Referring to FIG. 10A, in the LTE transmission mode 1, the LTEtransmission mode 3, or the NR resource allocation mode 1, a BS mayschedule an SL resource to be used by the UE for SL transmission. Forexample, the BS may perform resource scheduling to a UE 1 through aPDCCH (more specifically, downlink control information (DCI)), and theUE lmay perform V2X or SL communication with respect to a UE 2 accordingto the resource scheduling. For example, the UE 1 may transmit asidelink control information (SCI) to the UE 2 through a physicalsidelink control channel (PSCCH), and thereafter transmit data based onthe SCI to the UE 2 through a physical sidelink shared channel (PSSCH).

Referring to FIG. 10B, in the LTE transmission mode 2, the LTEtransmission mode 4, or the NR resource allocation mode 2, the UE maydetermine an SL transmission resource within an SL resource configuredby a BS/network or a pre-configured SL resource. For example, theconfigured SL resource or the pre-configured SL resource may be aresource pool. For example, the UE may autonomously select or schedule aresource for SL transmission. For example, the UE may perform SLcommunication by autonomously selecting a resource within a configuredresource pool. For example, the UE may autonomously select a resourcewithin a selective window by performing a sensing and resource(re)selection procedure. For example, the sensing may be performed inunit of subchannels. In addition, the UE 1 which has autonomouslyselected the resource within the resource pool may transmit the SCI tothe UE 2 through a PSCCH, and thereafter may transmit data based on theSCI to the UE 2 through a PSSCH.

FIGS. 11A-11C show three cast types, in accordance with an embodiment ofthe present disclosure. The embodiment of FIGS. 11A-11C may be combinedwith various embodiments of the present disclosure. Specifically, FIG.11A shows broadcast-type SL communication, FIG. 11B shows unicasttype-SL communication, and FIG. 11C shows groupcast-type SLcommunication. In case of the unicast-type SL communication, a UE mayperform one-to-one communication with respect to another UE. In case ofthe groupcast-type SL transmission, the UE may perform SL communicationwith respect to one or more UEs in a group to which the UE belongs. Invarious embodiments of the present disclosure, SL groupcastcommunication may be replaced with SL multicast communication, SLone-to-many communication, or the like.

Meanwhile, in various embodiments of the present disclosure, forexample, a transmitting UE (TX UE) may be a UE transmitting data to a(target) receiving UE (RX UE). For example, a TX UE may be a UEperforming PSCCH and/or PSSCH transmission. And/or, for example, a TX UEmay be a UE that transmits an SL CSI-RS and/or SL CSI report requestindicator to a (target) RX UE. And/or, for example, a TX UE may be a UEthat transmits a reference signal (e.g., DM-RS, CSI-RS) on a channeland/or the (control) channel (e.g., PSCCH, PSSCH) to be used for the SLRLM and/or SL RLF operation of a (target) RX UE.

Meanwhile, in various embodiments of the present disclosure, forexample, a receiving UE (RX UE) may be a UE transmitting SL HARQfeedback to a transmitting UE (TX UE) according to whether decoding ofdata received from the TX UE succeeds and/or whether thedetection/decoding success of a PSCCH (related to a PSSCH scheduling)transmitted by the TX UE. And/or, for example, a RX UE may be a UE thatperforms SL CSI transmission to a TX UE based on the SL CSI-RS and/orthe SL CSI report request indicator received from the TX UE. And/or, forexample, a RX UE is a UE that transmits to a TX UE a SL (L1) RSRPmeasurement value measured based on a (pre-defined) reference signaland/or the SL (L1) RSRP report request indicator received from the TXUE. And/or, for example, a RX UE may be a UE that transmits its own datato a TX UE. And/or, for example, a RX UE may be a UE that performs SLRLM and/or SL RLF operations based on a reference signal on a (control)channel and/or a (pre-configured) (control) channel received from a TXUE.

Meanwhile, in various embodiments of the present disclosure, forexample, when the RX UE transmits SL HARQ feedback information for thePSSCH and/or PSCCH received from the TX UE, the following scheme or someof the following schemes may be considered. Herein, for example, thefollowing scheme or some of the following schemes may be limitedlyapplied only when the RX UE successfully decodes/detects the PSCCHscheduling the PSSCH.

(1) Groupcast HARQ feedback option 1: NACK information may betransmitted to the TX UE only when the RX UE fails to decode/receive thePSSCH received from the TX UE.

(2) Groupcast HARQ feedback option 2: When the RX UE succeeds indecoding/receiving the PSSCH received from the TX UE, ACK informationmay be transmitted to the TX UE, and when PSSCH decoding/receptionfails, NACK information may be transmitted to the TX UE.

Meanwhile, in various embodiments of the present disclosure, forexample, the transmitting UE may transmit the entirety or part ofinformation described below to the receiving UE through the SCI. Herein,for example, the transmitting UE may transmit the entirety or part ofthe information described below to the receiving UE through the firstSCI and/or the second SCI.

-   -   PSSCH and/or PSCCH related resource allocation information,        e.g., the number/positions of time/frequency resources, resource        reservation information (e.g., period), and/or    -   SL CSI report request indicator or SL (L1) RSRP (and/or SL (L1)        RSRQ and/or SL (L1) RSSI) report request indicator, and/or    -   SL CSI transmission indicator (or SL (L1) RSRP (and/or SL (L1)        RSRQ and/or SL (L1) RSSI) information transmission indicator))        (on a PSSCH), and/or    -   MCS information, and/or    -   Transmit power information, and/or    -   L1 destination ID information and/or L1 source ID information,        and/or    -   SL HARQ process ID information, and/or    -   New data indicator (NDI) information, and/or    -   Redundancy version (RV) information, and/or    -   (Transmission traffic/packet related) QoS information, e.g.,        priority information, and/or    -   SL CSI-RS transmission indicator or information on the number of        (to-be-transmitted) SL CSI-RS antenna ports, and/or    -   Location information of a transmitting UE or location (or        distance region) information of a target receiving UE (for which        SL HARQ feedback is requested), and/or    -   Reference signal (e.g., DMRS, etc.) related to channel        estimation and/or decoding of data to be transmitted through a        PSSCH, e.g., information related to a pattern of a        (time-frequency) mapping resource of DMRS, rank information,        antenna port index information, information on the number of        antenna ports

Meanwhile, in various embodiments of the present disclosure, forexample, since the TX UE may transmit the SCI, the first SCI and/or thesecond SCI to the RX UE through the PSCCH, the PSCCH may bereplaced/substituted with at least one of SCI, first SCI, and/or secondSCI. And/or, for example, the SCI may be replaced/replaced by the PSCCH,the first SCI and/or the second SCI. And/or, for example, since the TXUE may transmit the second SCI to the RX UE through the PSSCH, the PSSCHmay be replaced/substituted with the second SCI.

Meanwhile, in various embodiments of the present disclosure, forexample, when SCI configuration fields are divided into two groups inconsideration of the (relatively) high SCI payload size, the first SCIincluding the first SCI configuration field group may be referred to as1st SCI, and the second SCI including the second SCI configuration fieldgroup may be referred to as 2nd SCI. In addition, for example, the 1stSCI may be transmitted to the receiving UE through the PSCCH. Inaddition, for example, the 2nd SCI may be transmitted to the receivingUE through (independent) PSCCH, or may be piggybacked with data throughPSSCH and transmitted.

Meanwhile, in various embodiments of the present disclosure,“configuration” or “define” may mean (resource pool specific) (pre-)configuration from a base station or network (via pre-defined signaling(e.g., SIB, MAC, RRC, etc.)).

Meanwhile, in this specification, for example, since RLF may bedetermined based on an OUT-OF-SYNCH (OOS) indicator or an IN-SYNCH (IS)indicator, RLF may be replaced/replaced by an OUT-OF-SYNCH (OOS) or anIN-SYNCH (IS).

Meanwhile, in various embodiments of the present disclosure, a resourceblock (RB) may be replaced/substituted with a sub-carrier. In addition,for example, in the present disclosure, a packet or traffic may besubstituted/replaced with a transport block (TB) or MAC PDU according toa transmitted layer.

Meanwhile, in various embodiments of the present disclosure, forexample, a CBG may be replaced/substituted with a TB.

Meanwhile, in various embodiments of the present disclosure, forexample, a source ID may be replaced/substituted with a destination ID.

Meanwhile, in various embodiments of the present disclosure, forexample, a L1 ID may be replaced/substituted by a L2 ID. For example, aL1 ID may be a L1 source ID or a L1 destination ID. For example, a L2 IDmay be a L2 source ID or a L2 destination ID.

Meanwhile, in various embodiments of the present disclosure, a channelmay be replaced/substituted with a signal. For example,transmission/reception of a channel may include transmission/receptionof a signal. For example, transmission/reception of a signal may includetransmission/reception of a channel.

Meanwhile, in various embodiments of the present disclosure, forexample, a cast type may be interchanged/substituted with a unicast, agroupcast, and/or a broadcast. For example, a cast type may beinterchanged/substituted with at least one of unicast, groupcast, and/orbroadcast. For example, the cast or cast type may include unicast,groupcast and/or broadcast.

Meanwhile, in various embodiments of the present disclosure, forexample, resources may be interchanged/replaced with slots or symbols.

Meanwhile, in various embodiments of the present disclosure, forconvenience of explanation, for example, a (physical) channel used whenthe RX UE transmits at least one of the following information to the TXUE may be referred to as a PSFCH.

-   -   SL HARQ feedback, SL CSI, SL (L1) RSRP

Meanwhile, in various embodiments of the present disclosure, thesidelink information may include at least one of a sidelink message, asidelink packet, a sidelink service, sidelink data, sidelink controlinformation, and/or a sidelink transport block (TB). For example, thesidelink information may be transmitted through a PSSCH and/or a PSCCH.

Meanwhile, in various embodiments of the present disclosure, the UE mayperform RSRP measurement by using reference signals transmitted througha plurality of antenna ports. For example, the UE may perform RSRPmeasurement using reference signals transmitted through a plurality ofantenna ports on a pre-defined channel. For example, RSRP measurementmay include L1 RSRP measurement.

For example, when measuring RSRP for DM-RS on a PSCCH/PSSCH during thesensing operation of the UE, the UE may perform RSRP measurement usingreference signals (RSs) transmitted through a plurality of antennaports. Herein, for example, for a sensing operation of a different UE,PSSCH DM-RS rank information and/or PSSCH DM-RS antenna port informationmay be signaled through 1st SCI (e.g., PSCCH).

For example, for estimating the sidelink pathloss of the transmittingUE, when the receiving UE measures/reports RSRP for a sidelink CSI-RS ora DM-RS on a PSCCH/PSSCH, the receiving UE may perform RSRP measurementby using RSs transmitted through a plurality of antenna ports.

Various embodiments of the present disclosure propose a method forefficiently supporting RSRP measurement using reference signalstransmitted through a plurality of antenna ports.

According to an embodiment of the present disclosure, after the UEmeasures RSRP for each reference signal of a different antenna portindex, the UE may consider the sum of the measured RSRP values as thefinal/representative RSRP measurement value. For example, after the UEmeasures RSRP for all reference signals of different antenna portindexes, the UE may determine the sum of the measured RSRP values as thefinal/representative RSRP measurement value. For example, after the UEmeasures RSRP for each RS of a pre-configured number (e.g., K) of APindexes, the UE may determine the sum of the measured RSRP values as thefinal/representative RSRP measurement value. For example, after the UEmeasures RSRP for each RS of the pre-configured relatively high K APindexes, the UE may determine the sum of the measured RSRP values as thefinal/representative RSRP measurement value. For example, after the UEmeasures RSRP for each RS of the pre-configured relatively low K APindexes, the UE may determine the sum of the measured RSRP values as thefinal/representative RSRP measurement value. For example, the relativelyhigh AP index may be an AP index having an index value higher than aspecific value. For example, the relatively low AP index may be an APindex having an index value lower than a specific value.

For example, after the UE measures RSRP for all reference signals ofdifferent antenna port indexes, the UE may determine the maximum orminimum value among the measured RSRP values as the final/representativeRSRP measurement value. For example, after the UE measures RSRP for eachRS of a pre-configured number (e.g., K) of AP indexes, the UE maydetermine the maximum or minimum value among the measured RSRP values asthe final/representative RSRP measurement value. For example, after theUE measures RSRP for each RS of a pre-configured relatively high K APindex, the UE may determine the maximum or minimum value among themeasured RSRP values as the final/representative RSRP measurement value.For example, after the UE measures RSRP for each RS of a pre-configuredrelatively low K AP index, the UE may determine the maximum or minimumvalue among the measured RSRP values as the final/representative RSRPmeasurement value.

For example, after the UE measures RSRP for all reference signals ofdifferent antenna port indexes, respectively, the UE may determine anaverage value or a weighted average value of the measured RSRP values asthe final/representative RSRP measurement value. For example, after theUE measures RSRP for each RS of a pre-configured number (e.g., K) of APindexes, the UE may determine an average value or a weighted averagevalue of the measured RSRP values as the final/representative RSRPmeasurement value. For example, after the UE measures RSRP for each RSof a pre-configured relatively high K AP index, the UE determines theaverage value or weighted average value of the measured RSRP values asthe final/representative RSRP measurement value. For example, after theUE measures the RSRP for each RS of a pre-configured relatively low K APindexes, the UE determines the average value or the weighted averagevalue of the measured RSRP values as the final/representative RSRPmeasurement value.

For example, if K is 1, the RSRP measurement value for the RS of thecorresponding antenna port index may be the final/representative value.For example, if K is 1, the UE may measure the RSRP for the referencesignal of the antenna port index where K is 1 among the two differentantenna port indexes, and the UE may determine the final/representativeRSRP value based on the measured RSRP value.

According to an embodiment of the present disclosure, after the UEmeasures RSRP value for a reference signal of one pre-configured antennaport index, the UE may derive/determine the final/representative RSRPvalue by adding a pre-configured offset value. For example, thepre-configured offset value may be determined based on the number ofantenna ports used to transmit the reference signal. For example, thepre-configured offset value may be determined based on a rank valuerelated to the reference signal. For example, the pre-configured offsetvalue may be 10*log(the number of antennas used to transmit thereference signal). For example, the pre-configured offset value may be10*log2(the number of antennas used to transmit the reference signal).For example, the pre-configured offset value may be 10*log(a rank valuerelated to the reference signal). For example, the pre-configured offsetvalue may be 10*log2(a rank value related to the reference signal). Forexample, the pre-configured offset value may be 10*log2.

Herein, for example, the pre-configured offset value may beconfigured/determined differently according to service type, priority,service requirement (e.g., priority, reliability, latency, minimumrequired communication range), cast type (e.g., unicast, groupcast,broadcast) and/or congestion level.

For example, after the UE measures the RSRP value for the referencesignal of the highest pre-configured antenna port index, the UE mayderive/determine the final/representative RSRP value by adding apre-configured offset value. For example, after the UE measures the RSRPvalue for the reference signal of one of the lowest pre-configuredantenna port index, the UE may derive/determine the final/representativeRSRP value by adding a pre-configured offset value.

FIG. 12 shows multiplexing cases of a PSCCH and a PSSCH related with thePSCCH, in accordance with an embodiment of the present disclosure. Theembodiment of FIG. 12 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 12 , multiplexing cases of a PSCCH and a PSSCH relatedwith the PSCCH may include option 1, option 2, and option 3. Forexample, option 1 may include option 1A and option 1B. For example, themeaning of “related” in the PSSCH related with the PSCCH may mean thatthe PSCCH transmits at least information necessary for decoding thePSSCH.

For example, option 1 may be that the PSCCH and the related PSSCH aretransmitted using non-overlapping time resources. For example, in option1A, the frequency resources used by the PSCCH and the related PSSCH maybe the same. For example, in option 1B, frequency resources used by thePSCCH and the related PSSCH may be different. For example, option 2 maybe that the PSCCH and the related PSSCH may be transmitted usingnon-overlapping frequency resources in all time resources used fortransmission. For example, the time resource used by the two channelsmay be the same. For example, in option 3, the PSCCH and a part of therelated PSSCH may be transmitted using overlapping time resources innon-overlapping frequency resources, and another part of the relatedPSSCH and/or another part of the PSCCH may be transmitted usingnon-overlapping time resources.

In various embodiments of the present disclosure, on the same symbol,information on whether or not frequency division multiplexing (FDM)between a reference signal and data and/or ratio information of energyper resource element (EPRE)/power spectral density (PSD) between areference signal and data (e.g., data being performed FDM) on the samesymbol may be provided by predefined signaling. For example, the UE mayreceive information on whether FDM between a reference signal and dataand/or information on a ratio of EPRE/PSD between a reference signal anddata (e.g., data being performed FDM) through predefined signaling. Forexample, the UE may receive information on whether FDM between areference signal and data on the same symbol and/or information on aratio of EPRE/PSD between a reference signal and data (e.g., data beingperformed FDM) on the same symbol through SCI or resource pool-specificconfiguration.

For example, if information on whether FDM between a reference signaland data and/or information on a ratio of EPRE/PSD between a referencesignal and data is provided to the UE, when the UE measures the RSRP forthe reference signal, the RSRP value may be compensated in considerationof specific information. For example, when the UE measures the RSRP forthe reference signal, the UE may compensate the RSRP value based on aratio occupied by the RE related to the reference signal among all REsin the same symbol or a ratio of power occupied by the RE related to thereference signal among the total symbol power in the same symbol. Forexample, when the UE measures the RSRP for the reference signal, the UEmay compensate the RSRP value based on 10*log(a ratio of the RE relatedto the reference signal among all REs in the same symbol) or 10*log(aratio of power for the RE related to the reference signal among thetotal symbol power). For example, when the UE measures the RSRP for thereference signal, the UE may compensate the RSRP value based on10*log2(a ratio of the RE related to the reference signal among all REsin the same symbol) or 10*log2(a ratio of power for the RE related tothe reference signal among the total symbol power).

In various embodiments of the present disclosure, referring to FIG. 12 ,when the PSCCH/PSSCH multiplexing of the option 3 is used, the UE maynot use the DM-RS on the PSSCH area being performed FDM with the PSCCHfor RSRP measurement. For example, when PSCCH PSD/EPRE boosting isperformed, the UE may not use the DM-RS on the PSSCH area beingperformed FDM with the PSCCH for RSRP measurement.

For example, when the PSCCH/PSSCH multiplexing of the option 3 is used,the UE may use the PSCCH and the DM-RS on the PSSCH area being performedFDM for RSRP measurement, and the UE may compensate for the power valueborrowed due to PSD/EPRE boosting of the PSCCH. That is, for example,the UE compensates for the power value borrowed due to PSD/EPRE boostingof the PSCCH being performed FDM, and the UE may average the RSRPmeasurement value for the DM-RS on the PSSCH area being performed FDMand the DM-RS on the PSSCH area being not performed FDM. For example,when the PSCCH/PSSCH multiplexing of the option 3 is used, the UE mayuse the PSCCH and the DM-RS on the PSSCH area being performed FDM forRSRP measurement, and the UE may compensate for a pre-configured offsetvalue. That is, for example, the UE compensates the pre-configuredoffset value for the RSRP measurement value, and the UE may average theRSRP measurement value for the DM-RS on the PSSCH area being performedFDM and the DM-RS on the PSSCH area being not performed FDM.

FIG. 13 shows a procedure for a UE to determine RSRP based on an indexof an antenna port, in accordance with an embodiment of the presentdisclosure. The embodiment of FIG. 13 may be combined with variousembodiments of the present disclosure.

Referring to FIG. 13 , in step S1310, a first UE may transmit areference signal on a PSCCH/PSSCH to a second UE. For example, areference signal may be a DM-RS or a sidelink CSI-RS. For example, thefirst UE may transmit a DM-RS on a PSCCH/PSSCH to the second UE. Forexample, the first UE may transmit a DM-RS on a PSCCH/PSSCH to thesecond UE using at least one antenna port.

In step S1320, the second UE may measure/determine RSRP based on anindex for an antenna port. For example, the second UE may measure RSRPfor each reference signal corresponding to an index for a differentantenna port. For example, the second UE may measure RSRP for each ofreference signals corresponding to indices for pre-configured K antennaports. For example, the second UE may measure RSRP for each of thereference signals corresponding to a pre-configured K antenna portshaving a relatively low index. For example, the second UE may measureRSRP for each of the reference signals corresponding to a pre-configuredK antenna ports having a relatively high index. For example, the secondUE may determine the sum of the measured RSRP values as thefinal/representative RSRP measurement value. For example, the second UEmay determine the highest RSRP value among the measured RSRP values asthe final/representative RSRP measurement value. For example, the secondUE may determine the lowest RSRP value among the measured RSRP values asthe final/representative RSRP measurement value.

For example, when the value of K is 1 and the number of antenna portsthrough which the reference signal is transmitted is two, the second UEmay measure RSRP for the reference signal of the antenna port index inwhich K is 1 among the two different antenna port indexes, and thesecond UE may determine the final/representative RSRP value based on themeasured RSRP value.

For example, after the second UE measures the RSRP value for thereference signal of one pre-configured antenna port index, the second UEmay derive/determine a final/representative RSRP value by adding apre-configured first offset value to the measured RSRP value. Forexample, after the second UE measures the RSRP value for the referencesignal of the pre-configured highest antenna port index, the second UEmay derive/determine a final/representative RSRP value by adding apre-configured first offset value to the measured RSRP value. Forexample, after the second UE measures the RSRP value for the referencesignal of the pre-configured lowest antenna port index, the second UEmay derive/determine a final/representative RSRP value by adding apre-configured first offset value to the measured RSRP value. Forexample, the pre-configured first offset value may be determined basedon the number of antenna ports used for transmitting the referencesignal. For example, the pre-configured first offset value may bedetermined based on a rank value related to the reference signal. Forexample, the pre-configured first offset value may be 10*log(the numberof antennas used to transmit the reference signal). For example, thepre-configured first offset value may be 10*log2(the number of antennasused to transmit the reference signal). For example, the pre-configuredfirst offset value may be 10*log2. For example, the pre-configured firstoffset value may be configured/determined differently according toservice type, priority, service requirement (e.g., priority,reliability, latency, minimum required communication range), cast type(e.g., unicast, groupcast, broadcast) and/or congestion level.

In step S1330, the second UE may transmit the RSRP value to the firstUE. For example, the RSRP value may be a final/representative RSRPmeasurement value determined based on the index for the antenna port.For example, the RSRP value may be a final/representative RSRPmeasurement value obtained by adding a pre-configured first offset valueto the measured RSRP value.

FIG. 14 shows a procedure for a UE to determine RSRP based oninformation related to FDM in accordance with an embodiment of thepresent disclosure. The embodiment of FIG. 14 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 14 , in step S1410, a first UE may transmit areference signal on a PSCCH/PSSCH to a second UE. For example, areference signal may be a DM-RS or a sidelink CSI-RS. For example, thefirst UE may transmit a DM-RS on a PSCCH/PSSCH to the second UE.

In step S1420, the second UE may measure/determine RSRP based oninformation related to FDM. For example, the information related to theFDM includes information on whether or not frequency divisionmultiplexing (FDM) between a reference signal and data and/or ratioinformation of energy per resource element (EPRE)/power spectral density(PSD) between a reference signal and data (e.g., data being performedFDM) on the same symbol. For example, the information related to the FDMmay be provided to the second UE by predefined signaling. For example,the information related to the FDM may be provided to the second UEthrough a SCI or resource pool-specific configuration.

For example, the second UE may measure the RSRP for the reference signalon the PSCCH/PSSCH. For example, the second UE may compensate themeasured RSRP value based on a ratio occupied by at least one RE relatedto the reference signal among all REs in the same symbol or a ratio ofpower occupied by at least one RE related to the reference signal amongthe total symbol power in the same symbol. For example, the second UEmay compensate the RSRP value based on 10*log(a ratio of at least one RErelated to the reference signal among all REs in the same symbol) or10*log(a ratio of power for at least one RE related to the referencesignal among the total symbol power). For example, the second UE maycompensate the RSRP value based on 10*log2(a ratio of at least one RErelated to the reference signal among all REs in the same symbol) or10*log2(a ratio of power for at least one RE related to the referencesignal among the total symbol power).

For example, when the PSCCH/PSSCH multiplexing of the option 3 is used,the second UE may not use the DM-RS on the PSSCH area being performedFDM with the PSCCH for RSRP measurement. For example, when PSCCHPSD/EPRE boosting is performed, the second UE may not use the DM-RS onthe PSSCH area being performed FDM with the PSCCH for RSRP measurement.

Alternatively, For example, when the PSCCH/PSSCH multiplexing of theoption 3 is used, the second UE may use the PSCCH and the DM-RS on thePSSCH area being performed FDM for RSRP measurement, and the second UEmay compensate for the power value borrowed due to PSD/EPRE boosting ofthe PSCCH. For example, the second UE compensates for the power valueborrowed due to PSD/EPRE boosting of the PSCCH being performed FDM, andthe second UE may average the RSRP measurement value for the DM-RS onthe PSSCH area being performed FDM and the DM-RS on the PSSCH area beingnot performed FDM. For example, the second UE may determine the RSRPvalue by adding a pre-configured second offset value to the measuredRSRP value, so that the UE averages the RSRP measurement value for theDM-RS on the PSSCH area being performed FDM and the DM-RS on the PSSCHarea being not performed FDM.

In step S1430, the second UE may transmit the RSRP value to the firstUE. For example, the RSRP value may be an RSRP measurement valuecompensated based on a ratio occupied by at least one RE related to areference signal among all REs or a ratio of power occupied by at leastone RE related to a reference signal among total symbol power. Forexample, the RSRP value may be an RSRP measurement value in which apower value borrowed due to PSD/EPRE boosting of the PSCCH iscompensated. For example, the RSRP value may be a value obtained byadding a pre-configured second offset value to the measured RSRP value.

FIG. 15 shows a procedure for compensating for a first offset value anda second offset value to a RSRP value measured by a UE in accordancewith an embodiment of the present disclosure. The embodiment of FIG. 15may be combined with various embodiments of the present disclosure.

In FIG. 15 , it may be assumed that a first UE transmits a referencesignal on PSCCH/PSSCH using at least one antenna port, and that thereference signal and data are performed FDM.

Referring to FIG. 15 , in step S1510, a first UE may transmit areference signal on a PSCCH/PSSCH to a second UE. For example, areference signal may be a DM-RS or a sidelink CSI-RS. For example, thefirst UE may transmit a DM-RS on a PSCCH/PSSCH to the second UE. Forexample, the first UE may transmit a DM-RS on a PSCCH/PSSCH to thesecond UE using at least one antenna port.

In step S1520, the second UE may measure RSRP. For example, the secondUE may measure RSRP for each reference signal corresponding to an indexfor a different antenna port. For example, the second UE may measureRSRP for each of reference signals corresponding to indices forpre-configured K antenna ports. For example, the second UE may measureRSRP for each of the reference signals corresponding to a pre-configuredK antenna ports having a relatively high index. For example, the secondUE may measure a RSRP value for the reference signal of onepre-configured antenna port index. For example, when the PSCCH/PSSCHmultiplexing of the option 3 described above is used, the secondterminal may not use a reference signal on the PSSCH area beingperformed FDM with the PSCCH for RSRP measurement. That is, for example,when the PSCCH/PSSCH multiplexing of the option 3 described above isused for a reference signal transmitted using at least one antenna port,the second UE may measure RSRP for a reference signal corresponding toan index for one pre-configured antenna port, and a reference signal onthe PSSCH area being performed FDM with the PSCCH may not be used forRSRP measurement.

In step S1530, the second UE may compensate a first offset value to themeasured RSRP value. For example, the first offset value may be theabove-described pre-configured first offset value. For example, thesecond UE may add the first offset value determined based on the numberof antenna ports used to transmit the reference signal to the measuredRSRP value. For example, the second UE may add the first offset valuedetermined based on a rank value related to the reference signal to themeasured RSRP value. For example, the second UE may add a value of10*log(the number of antennas used to transmit the reference signal) tothe measured RSRP value. For example, the second UE may add a value of10*log2(the number of antennas used to transmit the reference signal) tothe measured RSRP value.

In step S1540, the second UE may compensate a second offset value to themeasured RSRP value. For example, the second offset value may be thepre-configured second offset value. For example, the second offset valuemay be determined based on a ratio occupied by at least one RE relatedto the reference signal among all REs in the same symbol or a ratio ofpower occupied by at least one RE related to the reference signal amongtotal symbol power. For example, the second offset value may bedetermined based on 10*log(a ratio occupied by at least one RE relatedto the reference signal among all REs in the same symbol) or 10*log (aratio of power occupied by at least one RE related to the referencesignal among total symbol power in the same symbol). For example, thesecond offset value may be determined based on 10*log2(a ratio occupiedby at least one RE related to the reference signal among all REs in thesame symbol) or 10*log2(a ratio of power occupied by at least one RErelated to the reference signal among total symbol power in the samesymbol). For example, the second offset value may be determined based ona power value borrowed due to PSD/EPRE boosting of the PSCCH beingperformed FDM.

In step S1550, the second UE may transmit the RSRP value to the firstUE. For example, the RSRP value may be a value obtained by adding atleast one of a first offset value or a second offset value to the RSRPvalue measured by the second UE.

Meanwhile, according to an embodiment of the present disclosure, inorder to alleviate the problem of collision of transmission resourcesbetween different UEs, a SCI related to initial transmission may includeresource allocation information may include scheduling/resourceallocation information related to retransmission (e.g., thenumber/location of time domain resources, the number/location offrequency domain resources, MCS). For example, a SCI related toretransmission may include scheduling/resource allocation informationrelated to initial transmission.

In this case, for example, if a sidelink CSI-RS is transmitted oninitial transmission, it may need to be defined whether the sidelinkCSI-RS should be transmitted also on the retransmission. For example,whether to transmit sidelink CSI-RS on retransmission may have to bedefined whether it can be independently determined. For example, if theUE transmits a sidelink CSI-RS when performing initial transmission,whether the UE must transmit the sidelink CSI-RS even when performingretransmission may be defined. For example, when the UE performsretransmission, it may be defined whether or not to perform sidelinkCSI-RS transmission can be independently determined. For example, if itis defined to independently determine whether to transmit sidelinkCSI-RS on retransmission, if the UE fails to receive the SCI related toretransmission, the UE may still determine scheduling/resourceallocation information related to retransmission based on thesuccessfully received SCI related to initial transmission. However,since the UE cannot know whether the sidelink CSI-RS (e.g., the sidelinkCSI-RS signaled through the retransmission-related SCI) is actuallytransmitted, the UE may ultimately fail to receive the packet.

Hereinafter, various embodiments of the present disclosure propose amethod for efficiently processing sidelink CSI-RS transmission.

For example, when a sidelink CSI report and/or RSRP information istransmitted/piggybacked on initial transmission, various embodiments ofthe present disclosure may be extended to solve the problem of whethersidelink CSI reporting and/or RSRP information should beincluded/piggybacked even on retransmission. For example, whentransmission based on slot aggregation is performed, if sidelink CSI-RS,sidelink CSI report and/or RSRP information is transmitted/piggybackedon initial transmission, various embodiments of the present disclosuremay be extended to solve the problem of whether sidelink CSI-RS,sidelink CSI report and/or RSRP information should beincluded/piggybacked even on retransmission.

According to an embodiment of the present disclosure, when a UE performsinitial transmission related to a transport block (TB), if the UE hastransmitted/piggybacked sidelink CSI-RS, sidelink CSI report and/or RSRPinformation (e.g., L1 RSRP information), it may be configured for the UEto include/piggyback sidelink CSI-RS, sidelink CSI report and/or RSRPinformation even on retransmission. For example, when a UE performsinitial transmission related to a specific TB, if the UE hastransmitted/piggybacked sidelink CSI-RS, sidelink CSI report and/or RSRPinformation (e.g., L1 RSRP information), it may be configured for the UEto include/piggyback sidelink CSI-RS, sidelink CSI report and/or RSRPinformation even on some or all subsequent retransmissions. For example,when a UE performs initial transmission related to a specific TB, if theUE has transmitted/piggybacked sidelink CSI-RS, sidelink CSI reportand/or RSRP information (e.g., L1 RSRP information), it may beconfigured for the UE not to include/piggyback sidelink CSI-RS, sidelinkCSI report and/or RSRP information even on some or all subsequentretransmissions.

For example, an embodiment of the present disclosure may be extended andapplied to signaling to the UE information on whether to transmitsidelink CSI-RS on retransmission, through SCI related to initialtransmission.

Herein, for example, to reduce the overhead related with thetransmission of sidelink CSI-RS, sidelink CSI reporting and/or RSRPinformation, when the UE performs TB-related transmission a total of Ntimes (e.g., the number of times including all initialtransmission/retransmission), with what number, rate, and/or timepattern, sidelink CSI-RS, sidelink CSI report and/or RSRP informationtransmission should be performed may be configured for the UE. Forexample, when the UE performs transmission related to a specific TB atotal of N times, with what number, rate, and/or time pattern, sidelinkCSI-RS, sidelink CSI report and/or RSRP information transmission shouldbe performed may be pre-configured resource pool-specifically for theUE. For example, when the UE performs TB-related transmission a total of4 times, if a sidelink CSI-RS is transmitted on a first transmission,the UE may be configured to perform the sidelink CSI-RS transmission ina third transmission. For example, when the UE performs TB-relatedtransmission a total of 4 times, if the sidelink CSI-RS is transmittedon a first transmission, the UE may omit the sidelink CSI-RS on asecond/fourth transmission.

According to an embodiment of the present disclosure,transmission/piggyback of sidelink CSI-RS, sidelink CSI report and/orRSRP information on retransmission may be defined to beperformed/determined independently of operation/form on initialtransmission. For example, the UE may perform transmission/piggyback ofsidelink CSI-RS, sidelink CSI report and/or RSRP information onretransmission independently of operation/form of initial transmission.

FIG. 16 shows a procedure for a UE to perform a plurality of TB-relatedtransmissions in accordance with an embodiment of the presentdisclosure. The embodiment of FIG. 16 may be combined with variousembodiments of the present disclosure.

In FIG. 16 , when the first UE performs TB-related transmission a totalof 4 times, if a sidelink CSI-RS is transmitted based on a firsttransmission, it may be assumed that the sidelink CSI-RS is configuredto be transmitted based on a third transmission. For example, when thefirst UE performs TB-related transmission 4 times (e.g., the number oftimes including all initial transmission/retransmission), with whatnumber, rate, and/or time pattern, the transmission of sidelink CSI-RS,sidelink CSI report and/or RSRP information should be performed may beconfigured for the first UE.

Referring to FIG. 16 , in step S1610, a first UE may transmit a sidelinkCSI-RS to a second UE on a first transmission related with a TB. Forexample, the first transmission related with the TB may be an initialtransmission. For example, the first UE may transmit/piggyback thesidelink CSI-RS, the sidelink CSI report and/or RSRP information (e.g.,L1 RSRP information) on the first transmission related to the TB.

In step S1620, the first UE may perform a second transmission related tothe TB to the second UE. For example, the first UE may omittransmission/piggyback of sidelink CSI-RS, sidelink CSI report and/orRSRP information (e.g., L1 RSRP information) on the second transmissionrelated to TB. For example, the first UE may be configured to performtransmission of sidelink CSI-RS, sidelink CSI report and/or RSRPinformation (e.g., L1 RSRP information) though a third transmissionrelated to TB through predefined signaling. For example, the first UEmay omit transmission/piggyback of sidelink CSI-RS, sidelink CSI reportand/or RSRP information (e.g., L1 RSRP information) on the secondtransmission related to TB based on a predefined configuration.

In step S1630, the first UE may transmit the sidelink CSI-RS to thesecond UE on a third transmission related to the TB. For example, thefirst UE may transmit/piggyback the sidelink CSI-RS, the sidelink CSIreport and/or RSRP information (e.g., L1 RSRP information) on a fourthtransmission related to the TB. For example, the first UE may beconfigured to perform transmission of sidelink CSI-RS, sidelink CSIreport and/or RSRP information on the third transmission related to TBthrough predefined signaling. For example, the first UE maytransmit/piggyback the sidelink CSI-RS, the sidelink CSI report and/orRSRP information (e.g., L1 RSRP information) on the third transmissionrelated to the TB based on a predefined configuration.

In step S1640, the first UE may perform a fourth transmission related tothe TB to the second UE. For example, the first UE may omittransmission/piggyback of sidelink CSI-RS, sidelink CSI report and/orRSRP information (e.g., L1 RSRP information) on the fourth transmissionrelated to TB. For example, the first terminal may be configured toperform transmission of sidelink CSI-RS, sidelink CSI report and/or RSRPinformation on the third transmission related to TB through predefinedsignaling. For example, the first UE may omit transmission/piggyback ofsidelink CSI-RS, sidelink CSI report and/or RSRP information (e.g., L1RSRP information) on the fourth transmission related to TB based on apredefined configuration.

According to an embodiment of the present disclosure, the first UE mayperform transmission/piggyback of sidelink CSI-RS, sidelink CSI reportand/or RSRP information on retransmission independently ofoperation/form of initial transmission. .

FIG. 17 shows a method for a first device to determine RSRP based onindexes for a plurality of antenna ports in accordance with anembodiment of the present disclosure. The embodiment of FIG. 17 may becombined with various embodiments of the present disclosure.

Referring to FIG. 17 , in step S1710, the first device 100 may receive aplurality of reference signals from a second device 200 through aphysical sidelink control channel (PSCCH) or a physical sidelink sharedchannel (PSSCH). For example, the plurality of reference signals may betransmitted through a plurality of antenna ports.

In step S1720, the first device 100 may determine a reference signalreceived power (RSRP) value using the plurality of reference signalsbased on indexes for the plurality of antenna ports. For example, thefirst device 100 may measure RSRP using a reference signal of each ofthe indexes for the plurality of antenna ports. For example, the RSRPvalue may be determined as the sum of the RSRP measurement values ofeach of the indexes for the plurality of antenna ports. For example, theRSRP value may be determined as an average value for the RSRPmeasurement value of each of the indexes for the plurality of antennaports. For example, the RSRP value may be determined as the largestvalue among the RSRP measurement values of each of the indexes for theplurality of antenna ports. For example, the RSRP value may bedetermined as the smallest value among the RSRP measurement values ofeach of the indexes for the plurality of antenna ports.

For example, the first device 100 may measure RSRP through a referencesignal of an index for a pre-configured antenna port. For example, theRSRP value may be determined as a value obtained by adding apre-configured offset value to the RSRP measurement value. For example,the pre-configured offset value is determined based on the number of theplurality of antenna ports. For example, the pre-configured offset valueis determined differently based on at least one of a service type, apriority, a service requirement, or a cast type.

For example, information related to whether at least one referencesignal among the plurality of reference signals is performed frequencydivision multiplexing (FDM) with sidelink data is transmitted throughpredefined signaling. For example, information related to whether atleast one reference signal among the plurality of reference signals isperformed frequency division multiplexing (FDM) with sidelink data istransmitted to the first device 100 through predefined signaling. Forexample, based on the at least one reference signal being performed FDMwith the sidelink data, the first device 100 may compensate apre-configured value for the RSRP value. For example, based on the atleast one reference signal being performed FDM with the sidelink data,the at least one reference signal may be not used for RSRP measurement.

For example, the first device 100 may transmit the RSRP value to thesecond device 200.

The above-described embodiment may be applied to various devices to bedescribed below. First, for example, the processor 102 of the firstdevice 100 may control the transceiver 106 to receive a plurality ofreference signals from a second device 200 through a physical sidelinkcontrol channel (PSCCH) or a physical sidelink shared channel (PSSCH).And, for example, the processor 102 of the first device 100 maydetermine a reference signal received power (RSRP) value using theplurality of reference signals based on indexes for the plurality ofantenna ports. And, for example, the processor 102 of the first device100 may control the transceiver 106 to transmit the RSRP value to thesecond device 200.

According to an embodiment of the present disclosure, a first deviceconfigured to perform wireless communication may be provided. Forexample, the first device may comprise: one or more memories storinginstructions; one or more transceivers; and one or more processorsconnected to the one or more memories and the one or more transceivers.For example, the one or more processors may execute the instructions to:receive a plurality of reference signals from a second device through aphysical sidelink control channel (PSCCH) or a physical sidelink sharedchannel (PSSCH), the plurality of reference signals are transmittedthrough a plurality of antenna ports, and determine a reference signalreceived power (RSRP) value using the plurality of reference signalsbased on indexes for the plurality of antenna ports, and transmit theRSRP value to the second device.

According to an embodiment of the present disclosure, an apparatusconfigured to control a first user equipment (UE) may be provided. Forexample, the apparatus may comprise: one or more processors; and one ormore memories operably connected to the one or more processors andstoring instructions. For example, the one or more processors mayexecute the instructions to: receive a plurality of reference signalsfrom a second UE through a physical sidelink control channel (PSCCH) ora physical sidelink shared channel (PSSCH), the plurality of referencesignals are transmitted through a plurality of antenna ports, anddetermine a reference signal received power (RSRP) value using theplurality of reference signals based on indexes for the plurality ofantenna ports, and transmit the RSRP value to the second UE.

According to an embodiment of the present disclosure, a non-transitorycomputer-readable storage medium storing instructions may be provided.For example, the instructions, when executed, cause a first device to:receive a plurality of reference signals from a second device through aphysical sidelink control channel (PSCCH) or a physical sidelink sharedchannel (PSSCH), the plurality of reference signals are transmittedthrough a plurality of antenna ports, and determine a reference signalreceived power (RSRP) value using the plurality of reference signalsbased on indexes for the plurality of antenna ports, and transmit theRSRP value to the second device.

FIG. 18 shows a method for a second device 200 to receive the RSRP valuefrom a first device 100 in accordance with an embodiment of the presentdisclosure. The embodiment of FIG. 18 may be combined with variousembodiments of the present disclosure.

Referring to FIG. 18 , in step S1810, the second device 200 may transmita plurality of reference signals to the first device 100 through aphysical sidelink control channel (PSCCH) or a physical sidelink sharedchannel (PSSCH). For example, the plurality of reference signals may betransmitted through a plurality of antenna ports.

In step S1820, the second device 200 may receive a reference signalreceived power (RSRP) value from the first device 100. For example, theRSRP value may be determined through the plurality of reference signalsbased on indexes for the plurality of antenna ports. For example, theRSRP value may be determined as the sum of the RSRP measurement valuesof each of the indexes for the plurality of antenna ports. For example,the RSRP value may be determined as an average value for the RSRPmeasurement value of each of the indexes for the plurality of antennaports. For example, the RSRP value may be determined as the largestvalue among the RSRP measurement values of each of the indexes for theplurality of antenna ports. For example, the RSRP value may bedetermined as the smallest value among the RSRP measurement values ofeach of the indexes for the plurality of antenna ports.

For example, RSRP may be measured by the first device 100 through areference signal of an index for a pre-configured antenna port. Forexample, the RSRP value may be determined as a value obtained by addinga pre-configured offset value to the RSRP measurement value. Forexample, the pre-configured offset value is determined based on thenumber of the plurality of antenna ports. For example, thepre-configured offset value is determined differently based on at leastone of a service type, a priority, a service requirement, or a casttype.

For example, information related to whether at least one referencesignal among the plurality of reference signals is performed frequencydivision multiplexing (FDM) with sidelink data is transmitted throughpredefined signaling. For example, information related to whether atleast one reference signal among the plurality of reference signals isperformed frequency division multiplexing (FDM) with sidelink data istransmitted to the first device 100 through predefined signaling. Forexample, based on the at least one reference signal being performed FDMwith the sidelink data, a pre-configured value may be compensated forthe RSRP value by the first device 100. For example, based on the atleast one reference signal being performed FDM with the sidelink data,the at least one reference signal may be not used for RSRP measurement.

The above-described embodiment may be applied to various devices to bedescribed below. For example, the processor 202 of the second device 200may control the transceiver 206 to transmit a plurality of referencesignals to a first device 100 through a physical sidelink controlchannel (PSCCH) or a physical sidelink shared channel (PSSCH). And, theprocessor 202 of the second device 200 may control the transceiver 206to receive a reference signal received power (RSRP) value from the firstdevice 100.

According to an embodiment of the present disclosure, a second deviceconfigured to perform wireless communication may be provided. Forexample, the second device may comprise: one or more memories storinginstructions; one or more transceivers; and one or more processorsconnected to the one or more memories and the one or more transceivers.For example, the one or more processors may execute the instructions to:transmit a plurality of reference signals to a first device through aphysical sidelink control channel (PSCCH) or a physical sidelink sharedchannel (PSSCH) and receive a reference signal received power (RSRP)value from the first device. For example, the plurality of referencesignals are transmitted through a plurality of antenna ports. Forexample, the RSRP value is determined through the plurality of referencesignals based on indexes for the plurality of antenna ports.

Hereinafter, an apparatus to which various embodiments of the presentdisclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 19 shows a communication system 1, in accordance with an embodimentof the present disclosure.

Referring to FIG. 19 , a communication system 1 to which variousembodiments of the present disclosure are applied includes wirelessdevices, Base Stations (BSs), and a network. Herein, the wirelessdevices represent devices performing communication using Radio AccessTechnology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE))and may be referred to as communication/radio/5G devices. The wirelessdevices may include, without being limited to, a robot 100 a, vehicles100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-helddevice 100 d, a home appliance 100 e, an Internet of Things (IoT) device100 f, and an Artificial Intelligence (AI) device/server 400. Forexample, the vehicles may include a vehicle having a wirelesscommunication function, an autonomous vehicle, and a vehicle capable ofperforming communication between vehicles. Herein, the vehicles mayinclude an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR devicemay include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented in the form of a Head-Mounted Device(HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, asmartphone, a computer, a wearable device, a home appliance device, adigital signage, a vehicle, a robot, etc. The hand-held device mayinclude a smartphone, a smartpad, a wearable device (e.g., a smartwatchor a smartglasses), and a computer (e.g., a notebook). The homeappliance may include a TV, a refrigerator, and a washing machine. TheIoT device may include a sensor and a smartmeter. For example, the BSsand the network may be implemented as wireless devices and a specificwireless device 200 a may operate as a BS/network node with respect toother wireless devices.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100E

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 20 shows wireless devices, in accordance with an embodiment of thepresent disclosure.

Referring to FIG. 20 , a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100x} of FIG. 19 .

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof The one or more memories 104 and 204 may be locatedat the interior and/or exterior of the one or more processors 102 and202. The one or more memories 104 and 204 may be connected to the one ormore processors 102 and 202 through various technologies such as wiredor wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

FIG. 21 shows a signal process circuit for a transmission signal, inaccordance with an embodiment of the present disclosure.

Referring to FIG. 21 , a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 21 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 20 . Hardwareelements of FIG. 21 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 20 . For example, blocks1010 to 1060 may be implemented by the processors 102 and 202 of FIG. 20. Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 20 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 20 .

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 21 . Herein, the codewords are encoded bitsequences of information blocks. The information blocks may includetransport blocks (e.g., a UL-SCH transport block, a DL-SCH transportblock). The radio signals may be transmitted through various physicalchannels (e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 21 . For example, the wireless devices(e.g., 100 and 200 of FIG. 20 ) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

FIG. 22 shows another example of a wireless device, in accordance withan embodiment of the present disclosure. The wireless device may beimplemented in various forms according to a use-case/service (refer toFIG. 19 ).

Referring to FIG. 22 , wireless devices 100 and 200 may correspond tothe wireless devices 100 and 200 of FIG. 20 and may be configured byvarious elements, components, units/portions, and/or modules. Forexample, each of the wireless devices 100 and 200 may include acommunication unit 110, a control unit 120, a memory unit 130, andadditional components 140. The communication unit may include acommunication circuit 112 and transceiver(s) 114. For example, thecommunication circuit 112 may include the one or more processors 102 and202 and/or the one or more memories 104 and 204 of FIG. 20 . Forexample, the transceiver(s) 114 may include the one or more transceivers106 and 206 and/or the one or more antennas 108 and 208 of FIG. 20 . Thecontrol unit 120 is electrically connected to the communication unit110, the memory 130, and the additional components 140 and controlsoverall operation of the wireless devices. For example, the control unit120 may control an electric/mechanical operation of the wireless devicebased on programs/code/commands/information stored in the memory unit130. The control unit 120 may transmit the information stored in thememory unit 130 to the exterior (e.g., other communication devices) viathe communication unit 110 through a wireless/wired interface or store,in the memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 19), the vehicles (100 b-1 and 100 b-2 of FIG. 19 ), the XRdevice (100 c of FIG. 19 ), the hand-held device (100 d of FIG. 19 ),the home appliance (100 e of FIG. 19 ), the IoT device (100 f of FIG. 19), a digital broadcast terminal, a hologram device, a public safetydevice, an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 19 ), the BSs (200 of FIG. 19 ), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 22 , the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 22 will be described indetail with reference to the drawings.

FIG. 23 shows a hand-held device, in accordance with an embodiment ofthe present disclosure. The hand-held device may include a smartphone, asmartpad, a wearable device (e.g., a smartwatch or a smartglasses), or aportable computer (e.g., a notebook). The hand-held device may bereferred to as a mobile station (MS), a user terminal (UT), a MobileSubscriber Station (MSS), a Subscriber Station (SS), an Advanced MobileStation (AMS), or a Wireless Terminal (WT).

Referring to FIG. 23 , a hand-held device 100 may include an antennaunit 108, a communication unit 110, a control unit 120, a memory unit130, a power supply unit 140 a, an interface unit 140 b, and an I/O unit140 c. The antenna unit 108 may be configured as a part of thecommunication unit 110. Blocks 110 to 130/140 a to140 c correspond tothe blocks 110 to 130/140 of FIG. 22 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signals, audio information/signals, data, and/or informationinput by a user. The I/O unit 140 c may include a camera, a microphone,a user input unit, a display unit 140 d, a speaker, and/or a hapticmodule.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

FIG. 24 shows a vehicle or an autonomous vehicle, in accordance with anembodiment of the present disclosure. The vehicle or autonomous vehiclemay be implemented by a mobile robot, a car, a train, a manned/unmannedAerial Vehicle (AV), a ship, etc.

Referring to FIG. 24 , a vehicle or autonomous vehicle 100 may includean antenna unit 108, a communication unit 110, a control unit 120, adriving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, andan autonomous driving unit 140 d. The antenna unit 108 may be configuredas a part of the communication unit 110. The blocks 110/130/140 a to 140d correspond to the blocks 110/130/140 of FIG. 22 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous vehicle 100. The control unit 120 may includean Electronic Control Unit (ECU). The driving unit 140 a may cause thevehicle or the autonomous vehicle 100 to drive on a road. The drivingunit 140 a may include an engine, a motor, a powertrain, a wheel, abrake, a steering device, etc. The power supply unit 140 b may supplypower to the vehicle or the autonomous vehicle 100 and include awired/wireless charging circuit, a battery, etc. The sensor unit 140 cmay acquire a vehicle state, ambient environment information, userinformation, etc. The sensor unit 140 c may include an InertialMeasurement Unit (IMU) sensor, a collision sensor, a wheel sensor, aspeed sensor, a slope sensor, a weight sensor, a heading sensor, aposition module, a vehicle forward/backward sensor, a battery sensor, afuel sensor, a tire sensor, a steering sensor, a temperature sensor, ahumidity sensor, an ultrasonic sensor, an illumination sensor, a pedalposition sensor, etc. The autonomous driving unit 140 d may implementtechnology for maintaining a lane on which a vehicle is driving,technology for automatically adjusting speed, such as adaptive cruisecontrol, technology for autonomously driving along a determined path,technology for driving by automatically setting a path if a destinationis set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous vehicle 100 may movealong the autonomous driving path according to the driving plan (e.g.,speed/direction control). In the middle of autonomous driving, thecommunication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous vehicles and provide the predicted traffic information datato the vehicles or the autonomous vehicles.

Claims in the present description can be combined in a various way. Forinstance, technical features in method claims of the present descriptioncan be combined to be implemented or performed in an apparatus, andtechnical features in apparatus claims can be combined to be implementedor performed in a method. Further, technical features in method claim(s)and apparatus claim(s) can be combined to be implemented or performed inan apparatus. Further, technical features in method claim(s) andapparatus claim(s) can be combined to be implemented or performed in amethod.

What is claimed is:
 1. A method for performing wireless communication bya first device, the method comprising: receiving, from a second devicethrough a physical sidelink control channel (PSCCH), sidelink controlinformation (SCI) for scheduling a physical sidelink shared channel(PSSCH); receiving, from the second device, a plurality of demodulationreference signals (DMRS s), wherein the plurality of DMRSs are receivedthrough a plurality of antenna ports; and determining a reference signalreceived power (RSRP) for the PSSCH based on the plurality of DMRSs,wherein the RSRP is determined as a sum of a plurality of linear averagevalues of power contributions of the plurality of DMRSs, summed over theplurality of antenna ports.
 2. The method of claim 1, furthercomprising: transmitting the RSRP to the second device, wherein the SCIincludes antenna port information related to the plurality of DMRSs forthe PSSCH.
 3. The method of claim 1, wherein the plurality of DMRSs arereceived in resource elements included in DMRS symbols in a slot for thePSSCH, wherein the RSRP is determined based on the resource elements,and wherein the sum of the plurality of the linear average values of thepower contributions of the plurality of DMRSs are a sum of a pluralityof linear average values of power contributions of the resourceelements.
 4. The method of claim 1, wherein the plurality of the linearaverage values are determined based on weights related with theplurality of antenna ports.
 5. The method of claim 1, whereininformation related to whether at least one DMRS among the plurality ofDMRSs performs frequency division multiplexing (FDM) with sidelink datais transmitted via predefined signaling.
 6. The method of claim 5,further comprising: compensating a configured value for the RSRP basedon the at least one DMRS being performed FDM with the sidelink data. 7.The method of claim 6, wherein the configured value is determined basedon a ratio of REs occupied by the at least one DMRS among all resourceelements (RE) in a symbol.
 8. The method of claim 7, wherein theconfigured value is determined based on a ratio of power occupied by REsrelated to the at least one DMRS among powers for all symbols related tothe at least one DMRS.
 9. The method of claim 5, wherein at least oneDMRS is omitted from RSRP measurement, based on the at least one DMRSbeing performed FDM with the sidelink data.
 10. The method of claim 9,wherein boosting related to an energy per resource element (EPRE) forthe PSSCH or boosting related to a power spectral density (PSD) for thePSSCH is performed.
 11. The method of claim 9, further comprising:compensating for a value related to the at least one DMRS for the RSRP.12. The method of claim 1, wherein the SCI includes information relatedto whether at least one DMRS among the plurality of DMRSs is performedfrequency division multiplexing (FDM) with sidelink data.
 13. The methodof claim 12, wherein the SCI includes at least one of informationrelated to an EPRE between the at least one DMRS and sidelink data orinformation related to a PSD between the at least one DMRS and sidelinkdata.
 14. A first device for performing wireless communication, thefirst device comprising: one or more transceivers; one or moreprocessors; and one or more memories operably connectable to the one ormore processors and storing instructions that, based on being executedby the one or more processors, perform operations comprising: receiving,from a second device through a physical sidelink control channel(PSCCH), sidelink control information (SCI) for scheduling a physicalsidelink shared channel (PSSCH), receiving, from the second device, aplurality of demodulation reference signals (DMRSs), wherein theplurality of DMRSs are received through a plurality of antenna ports,and determining a reference signal received power (RSRP) for the PSSCHbased on the plurality of DMRSs, wherein the RSRP is determined as a sumof a plurality of linear average values of power contributions of theplurality of DMRSs, summed over the plurality of antenna ports.
 15. Thefirst device of claim 14, wherein the plurality of DMRSs are received inresource elements included in DMRS symbols in a slot for the PSSCH,wherein the RSRP is determined based on the resource elements, andwherein the sum of the plurality of the linear average values of thepower contributions of the plurality of DMRSs are a sum of a pluralityof linear average values of power contributions of the resourceelements.
 16. The first device of claim 14, wherein information relatedto whether at least one DMRS among the plurality of DMRSs performsfrequency division multiplexing (FDM) with sidelink data is transmittedvia predefined signaling, and at least one DMRS is omitted from RSRPmeasurement, based on the at least one DMRS being performed FDM with thesidelink data.
 17. The first device of claim 16, wherein boostingrelated to an energy per resource element (EPRE) for the PSSCH orboosting related to a power spectral density (PSD) for the PSSCH isperformed.
 18. A device configured to control a first user equipment(UE), the device comprising: one or more processors; and one or morememories operably connectable to the one or more processors and storinginstructions that, based on being executed by the one or moreprocessors, perform operations comprising: receiving, from a second UEthrough a physical sidelink control channel (PSCCH), sidelink controlinformation (SCI) for scheduling a physical sidelink shared channel(PSSCH), receiving, from the second UE, a plurality of demodulationreference signals (DMRSs), wherein the plurality of DMRSs are receivedthrough a plurality of antenna ports, and determining a reference signalreceived power (RSRP) for the PSSCH based on the plurality of DMRSs,wherein the RSRP is determined as a sum of a plurality of linear averagevalues of power contributions of the plurality of DMRSs, summed over theplurality of antenna ports.
 19. The device of claim 18, wherein theplurality of DMRSs are received in resource elements included in DMRSsymbols in a slot for the PSSCH, wherein the RSRP is determined based onthe resource elements, and wherein the sum of the plurality of thelinear average values of the power contributions of the plurality ofDMRSs are a sum of a plurality of linear average values of powercontributions of the resource elements.
 20. The device of claim 18,wherein the SCI includes information related to whether at least oneDMRS among the plurality of DMRSs is performed frequency divisionmultiplexing (FDM) with sidelink data, and wherein the SCI includes atleast one of information related to an EPRE between the at least oneDMRS and sidelink data or information related to a PSD between the atleast one DMRS and sidelink data.